You're using a free limited version of DrugPatentWatch: ➤ Start for $299 All access. No Commitment.

Last Updated: March 26, 2026

DOVATO Drug Patent Profile


✉ Email this page to a colleague

« Back to Dashboard


When do Dovato patents expire, and when can generic versions of Dovato launch?

Dovato is a drug marketed by Viiv Hlthcare and is included in one NDA. There are three patents protecting this drug and one Paragraph IV challenge.

This drug has three hundred and one patent family members in forty-nine countries.

The generic ingredient in DOVATO is dolutegravir sodium; lamivudine. There are seventeen drug master file entries for this compound. One supplier is listed for this compound. Additional details are available on the dolutegravir sodium; lamivudine profile page.

DrugPatentWatch® Generic Entry Outlook for Dovato

By analyzing the patents and regulatory protections it appears that the earliest date for generic entry will be January 24, 2031. This may change due to patent challenges or generic licensing.

There have been twenty-four patent litigation cases involving the patents protecting this drug, indicating strong interest in generic launch. Recent data indicate that 63% of patent challenges are decided in favor of the generic patent challenger and that 54% of successful patent challengers promptly launch generic drugs.

Indicators of Generic Entry

< Available with Subscription >

  Start Trial

AI Deep Research
Questions you can ask:
  • What is the 5 year forecast for DOVATO?
  • What are the global sales for DOVATO?
  • What is Average Wholesale Price for DOVATO?
Drug patent expirations by year for DOVATO
Drug Prices for DOVATO

See drug prices for DOVATO

DrugPatentWatch® Estimated Loss of Exclusivity (LOE) Date for DOVATO
Generic Entry Date for DOVATO*:
Constraining patent/regulatory exclusivity:
NDA:
Dosage:
TABLET;ORAL

*The generic entry opportunity date is the latter of the last compound-claiming patent and the last regulatory exclusivity protection. Many factors can influence early or later generic entry. This date is provided as a rough estimate of generic entry potential and should not be used as an independent source.

Recent Clinical Trials for DOVATO

Identify potential brand extensions & 505(b)(2) entrants

SponsorPhase
Johns Hopkins UniversityPHASE3
ViiV HealthcarePHASE3
Saskatchewan Health Authority - Regina AreaPHASE4

See all DOVATO clinical trials

Paragraph IV (Patent) Challenges for DOVATO
Tradename Dosage Ingredient Strength NDA ANDAs Submitted Submissiondate
DOVATO Tablets dolutegravir sodium; lamivudine 50 mg/300 mg 211994 1 2019-07-30

US Patents and Regulatory Information for DOVATO

DOVATO is protected by three US patents and one FDA Regulatory Exclusivity.

Based on analysis by DrugPatentWatch, the earliest date for a generic version of DOVATO is ⤷  Start Trial.

This potential generic entry date is based on patent 11,234,985.

Generics may enter earlier, or later, based on new patent filings, patent extensions, patent invalidation, early generic licensing, generic entry preferences, and other factors.

Applicant Tradename Generic Name Dosage NDA Approval Date TE Type RLD RS Patent No. Patent Expiration Product Substance Delist Req. Exclusivity Expiration
Viiv Hlthcare DOVATO dolutegravir sodium; lamivudine TABLET;ORAL 211994-001 Apr 8, 2019 RX Yes Yes 11,234,985 ⤷  Start Trial Y ⤷  Start Trial
Viiv Hlthcare DOVATO dolutegravir sodium; lamivudine TABLET;ORAL 211994-001 Apr 8, 2019 RX Yes Yes ⤷  Start Trial ⤷  Start Trial ⤷  Start Trial
Viiv Hlthcare DOVATO dolutegravir sodium; lamivudine TABLET;ORAL 211994-001 Apr 8, 2019 RX Yes Yes 8,129,385*PED ⤷  Start Trial Y ⤷  Start Trial
Viiv Hlthcare DOVATO dolutegravir sodium; lamivudine TABLET;ORAL 211994-001 Apr 8, 2019 RX Yes Yes 9,242,986*PED ⤷  Start Trial Y ⤷  Start Trial
>Applicant >Tradename >Generic Name >Dosage >NDA >Approval Date >TE >Type >RLD >RS >Patent No. >Patent Expiration >Product >Substance >Delist Req. >Exclusivity Expiration

International Patents for DOVATO

When does loss-of-exclusivity occur for DOVATO?

Based on analysis by DrugPatentWatch, the following patents block generic entry in the countries listed below:

African Regional IP Organization (ARIPO)

Patent: 51
Estimated Expiration: ⤷  Start Trial

Australia

Patent: 11209788
Estimated Expiration: ⤷  Start Trial

Patent: 14202404
Estimated Expiration: ⤷  Start Trial

Patent: 14202405
Estimated Expiration: ⤷  Start Trial

Patent: 14202406
Estimated Expiration: ⤷  Start Trial

Patent: 16204987
Estimated Expiration: ⤷  Start Trial

Patent: 17268621
Estimated Expiration: ⤷  Start Trial

Brazil

Patent: 2012018670
Estimated Expiration: ⤷  Start Trial

Canada

Patent: 87691
Estimated Expiration: ⤷  Start Trial

Patent: 67453
Estimated Expiration: ⤷  Start Trial

Patent: 03988
Estimated Expiration: ⤷  Start Trial

Patent: 60290
Estimated Expiration: ⤷  Start Trial

Chile

Patent: 12002080
Estimated Expiration: ⤷  Start Trial

China

Patent: 2791129
Estimated Expiration: ⤷  Start Trial

Patent: 5311033
Estimated Expiration: ⤷  Start Trial

Colombia

Patent: 02152
Estimated Expiration: ⤷  Start Trial

Costa Rica

Patent: 120423
Estimated Expiration: ⤷  Start Trial

Croatia

Patent: 0150770
Estimated Expiration: ⤷  Start Trial

Patent: 0180855
Estimated Expiration: ⤷  Start Trial

Patent: 0181531
Estimated Expiration: ⤷  Start Trial

Patent: 0240168
Estimated Expiration: ⤷  Start Trial

Cyprus

Patent: 16509
Estimated Expiration: ⤷  Start Trial

Patent: 20457
Estimated Expiration: ⤷  Start Trial

Patent: 21040
Estimated Expiration: ⤷  Start Trial

Patent: 26771
Estimated Expiration: ⤷  Start Trial

Patent: 18029
Estimated Expiration: ⤷  Start Trial

Patent: 24017
Estimated Expiration: ⤷  Start Trial

Denmark

Patent: 31027
Estimated Expiration: ⤷  Start Trial

Patent: 32970
Estimated Expiration: ⤷  Start Trial

Patent: 27542
Estimated Expiration: ⤷  Start Trial

Patent: 94972
Estimated Expiration: ⤷  Start Trial

Dominican Republic

Patent: 012000205
Estimated Expiration: ⤷  Start Trial

Patent: 021000147
Estimated Expiration: ⤷  Start Trial

Ecuador

Patent: 12012106
Estimated Expiration: ⤷  Start Trial

Eurasian Patent Organization

Patent: 5176
Estimated Expiration: ⤷  Start Trial

Patent: 2868
Estimated Expiration: ⤷  Start Trial

Patent: 7601
Estimated Expiration: ⤷  Start Trial

Patent: 1290583
Estimated Expiration: ⤷  Start Trial

Patent: 1690872
Estimated Expiration: ⤷  Start Trial

Patent: 1892277
Estimated Expiration: ⤷  Start Trial

Patent: 2190473
Estimated Expiration: ⤷  Start Trial

European Patent Office

Patent: 31027
Estimated Expiration: ⤷  Start Trial

Patent: 32970
Estimated Expiration: ⤷  Start Trial

Patent: 27542
Estimated Expiration: ⤷  Start Trial

Patent: 51249
Estimated Expiration: ⤷  Start Trial

Patent: 94972
Estimated Expiration: ⤷  Start Trial

Patent: 16599
Estimated Expiration: ⤷  Start Trial

Finland

Patent: 0240016
Estimated Expiration: ⤷  Start Trial

Patent: 94972
Estimated Expiration: ⤷  Start Trial

France

Patent: C1043
Estimated Expiration: ⤷  Start Trial

Patent: C1024
Estimated Expiration: ⤷  Start Trial

Hong Kong

Patent: 79522
Estimated Expiration: ⤷  Start Trial

Patent: 09629
Estimated Expiration: ⤷  Start Trial

Patent: 50335
Estimated Expiration: ⤷  Start Trial

Hungary

Patent: 26849
Estimated Expiration: ⤷  Start Trial

Patent: 37812
Estimated Expiration: ⤷  Start Trial

Patent: 40554
Estimated Expiration: ⤷  Start Trial

Patent: 65569
Estimated Expiration: ⤷  Start Trial

Patent: 800042
Estimated Expiration: ⤷  Start Trial

Patent: 400017
Estimated Expiration: ⤷  Start Trial

Israel

Patent: 1007
Estimated Expiration: ⤷  Start Trial

Patent: 5182
Estimated Expiration: ⤷  Start Trial

Patent: 7267
Estimated Expiration: ⤷  Start Trial

Patent: 7658
Estimated Expiration: ⤷  Start Trial

Patent: 1959
Estimated Expiration: ⤷  Start Trial

Japan

Patent: 68386
Estimated Expiration: ⤷  Start Trial

Patent: 24619
Estimated Expiration: ⤷  Start Trial

Patent: 13518107
Estimated Expiration: ⤷  Start Trial

Patent: 16145204
Estimated Expiration: ⤷  Start Trial

Patent: 17008087
Estimated Expiration: ⤷  Start Trial

Patent: 18127473
Estimated Expiration: ⤷  Start Trial

Patent: 19167371
Estimated Expiration: ⤷  Start Trial

Patent: 21091705
Estimated Expiration: ⤷  Start Trial

Patent: 22071126
Estimated Expiration: ⤷  Start Trial

Patent: 23085431
Estimated Expiration: ⤷  Start Trial

Patent: 25131664
Estimated Expiration: ⤷  Start Trial

Lithuania

Patent: 932970
Estimated Expiration: ⤷  Start Trial

Patent: 494972
Estimated Expiration: ⤷  Start Trial

Patent: 2018013
Estimated Expiration: ⤷  Start Trial

Patent: 2024516
Estimated Expiration: ⤷  Start Trial

Patent: 32970
Estimated Expiration: ⤷  Start Trial

Patent: 27542
Estimated Expiration: ⤷  Start Trial

Patent: 94972
Estimated Expiration: ⤷  Start Trial

Luxembourg

Patent: 0090
Estimated Expiration: ⤷  Start Trial

Malaysia

Patent: 8334
Estimated Expiration: ⤷  Start Trial

Patent: 2778
Estimated Expiration: ⤷  Start Trial

Patent: 7233
Estimated Expiration: ⤷  Start Trial

Mexico

Patent: 6891
Estimated Expiration: ⤷  Start Trial

Patent: 7937
Estimated Expiration: ⤷  Start Trial

Patent: 7938
Estimated Expiration: ⤷  Start Trial

Patent: 12008774
Estimated Expiration: ⤷  Start Trial

Montenegro

Patent: 182
Estimated Expiration: ⤷  Start Trial

Patent: 058
Estimated Expiration: ⤷  Start Trial

Morocco

Patent: 002
Estimated Expiration: ⤷  Start Trial

New Zealand

Patent: 1319
Estimated Expiration: ⤷  Start Trial

Patent: 7824
Estimated Expiration: ⤷  Start Trial

Patent: 7826
Estimated Expiration: ⤷  Start Trial

Patent: 7827
Estimated Expiration: ⤷  Start Trial

Norway

Patent: 18036
Estimated Expiration: ⤷  Start Trial

Patent: 32970
Estimated Expiration: ⤷  Start Trial

Peru

Patent: 121524
Estimated Expiration: ⤷  Start Trial

Patent: 160180
Estimated Expiration: ⤷  Start Trial

Philippines

Patent: 012501537
Estimated Expiration: ⤷  Start Trial

Patent: 016500195
Estimated Expiration: ⤷  Start Trial

Patent: 018502489
Estimated Expiration: ⤷  Start Trial

Poland

Patent: 31027
Estimated Expiration: ⤷  Start Trial

Patent: 32970
Estimated Expiration: ⤷  Start Trial

Patent: 27542
Estimated Expiration: ⤷  Start Trial

Patent: 94972
Estimated Expiration: ⤷  Start Trial

Portugal

Patent: 31027
Estimated Expiration: ⤷  Start Trial

Patent: 32970
Estimated Expiration: ⤷  Start Trial

Patent: 27542
Estimated Expiration: ⤷  Start Trial

Patent: 94972
Estimated Expiration: ⤷  Start Trial

San Marino

Patent: 01500177
Estimated Expiration: ⤷  Start Trial

Patent: 01800290
Estimated Expiration: ⤷  Start Trial

Patent: 01800594
Estimated Expiration: ⤷  Start Trial

Patent: 02400063
Estimated Expiration: ⤷  Start Trial

Serbia

Patent: 123
Estimated Expiration: ⤷  Start Trial

Patent: 323
Estimated Expiration: ⤷  Start Trial

Patent: 728
Estimated Expiration: ⤷  Start Trial

Patent: 183
Estimated Expiration: ⤷  Start Trial

Singapore

Patent: 2614
Estimated Expiration: ⤷  Start Trial

Patent: 201509476R
Estimated Expiration: ⤷  Start Trial

Patent: 201707183T
Estimated Expiration: ⤷  Start Trial

Slovenia

Patent: 31027
Estimated Expiration: ⤷  Start Trial

Patent: 32970
Estimated Expiration: ⤷  Start Trial

Patent: 27542
Estimated Expiration: ⤷  Start Trial

Patent: 94972
Estimated Expiration: ⤷  Start Trial

South Africa

Patent: 1205586
Estimated Expiration: ⤷  Start Trial

South Korea

Patent: 1830715
Estimated Expiration: ⤷  Start Trial

Patent: 1883750
Estimated Expiration: ⤷  Start Trial

Patent: 1964923
Estimated Expiration: ⤷  Start Trial

Patent: 120128640
Estimated Expiration: ⤷  Start Trial

Patent: 160111536
Estimated Expiration: ⤷  Start Trial

Patent: 170078868
Estimated Expiration: ⤷  Start Trial

Patent: 180078358
Estimated Expiration: ⤷  Start Trial

Spain

Patent: 43066
Estimated Expiration: ⤷  Start Trial

Patent: 70811
Estimated Expiration: ⤷  Start Trial

Patent: 88925
Estimated Expiration: ⤷  Start Trial

Patent: 69969
Estimated Expiration: ⤷  Start Trial

Tunisia

Patent: 12000376
Estimated Expiration: ⤷  Start Trial

Turkey

Patent: 1807704
Estimated Expiration: ⤷  Start Trial

Ukraine

Patent: 5556
Estimated Expiration: ⤷  Start Trial

Generics may enter earlier, or later, based on new patent filings, patent extensions, patent invalidation, early generic licensing, generic entry preferences, and other factors.

See the table below for additional patents covering DOVATO around the world.

Country Patent Number Title Estimated Expiration
Philippines 12007502373 Polycyclic carbamoylpyridone derivative having inhibitory activity on HIV integrase ⤷  Start Trial
Norway 2017010 ⤷  Start Trial
Dominican Republic P2012000205 ⤷  Start Trial
Netherlands 300676 ⤷  Start Trial
Poland 3127542 ⤷  Start Trial
Israel 225207 נגזרת של קרבאמוילפירידון רב-טבעתי, הרכב רוקחי המכיל אותה, השימוש בה ותהליך להכנתה (Polycyclic carbamoylpyridone derivative, pharmaceutical composition comprising the same, use and process for preparation thereof) ⤷  Start Trial
Japan 2016145204 ⤷  Start Trial
>Country >Patent Number >Title >Estimated Expiration

Supplementary Protection Certificates for DOVATO

Patent Number Supplementary Protection Certificate SPC Country SPC Expiration SPC Description
2465580 PA2021512,C2465580 Lithuania ⤷  Start Trial PRODUCT NAME: KABOTEGRAVIRAS; REGISTRATION NO/DATE: EU/1/20/1481 20201217
2932970 122018000125 Germany ⤷  Start Trial PRODUCT NAME: EINE KOMBINATION UMFASSEND DOLUTEGRAVIR ODER EIN PHARMAZEUTISCH ANNEHMBARES SALZ DAVON (Z. B DOLUTEGRAVIR NATRIUM) UND RILPIVIRIN ODER EIN PHARMAZEUTISCH ANNEHMBARES SALZ DAVON (Z.B RILPIVIRIN HYDROCHLORID); REGISTRATION NO/DATE: EU/1/18/1282 20180516
3494972 2024C/522 Belgium ⤷  Start Trial PRODUCT NAME: DOLUTEGRAVIR OF EEN FARMACEUTISCH AANVAARDBAAR ZOUT ERVAN, MET INBEGRIP VAN DOLUTEGRAVIRNATRIUM, EN LAMIVUDINE; AUTHORISATION NUMBER AND DATE: EU/1/19/1370 20190703
2465580 CR 2021 00010 Denmark ⤷  Start Trial PRODUCT NAME: CABOTEGRAVIR ELLER ET FARMACEUTISK ACCEPTABELT SALT ELLER SOLVAT DERAF; REG. NO/DATE: EU/1/20/1481 20201221
1874117 C 2014 024 Romania ⤷  Start Trial PRODUCT NAME: DOLUTEGRAVIR SAU O SARE SAU SOLVAT AL ACESTUIAACCEPTABILE FARMACEUTIC, INCLUSIV DOLUTEGRAVIR DESODIU; NATIONAL AUTHORISATION NUMBER: EU/1/13/892; DATE OF NATIONAL AUTHORISATION: 20140116; NUMBER OF FIRST AUTHORISATION IN EUROPEAN ECONOMIC AREA (EEA): EU/1/13/892; DATE OF FIRST AUTHORISATION IN EEA: 20140116
2932970 SPC/GB18/041 United Kingdom ⤷  Start Trial PRODUCT NAME: A COMBINATION COMPRISING DOLUTEGRAVIR OR A PHARMACEUTICALLY ACCEPTABLE SALT THEREOF (E.G. DOLUTEGRAVIR SODIUM) AND RILPIVIRINE OR A PHARAMACEUTICALLY ACCEPTABLE SALT THEREOF (E.G. RILPIVIRINE HYDROCHLORIDE); REGISTERED: UK EU/1/18/1282 20180518; UK PLGB 35728/0055 20180518; UK PLGB 35728/0056 20180518; UK PLGB 35728/0057 20180518
2465580 301109 Netherlands ⤷  Start Trial PRODUCT NAME: CABOTEGRAVIR; REGISTRATION NO/DATE: EU/1/20/1481 20201217
>Patent Number >Supplementary Protection Certificate >SPC Country >SPC Expiration >SPC Description

Market Dynamics and Financial Trajectory for DOVATO

Last updated: February 19, 2026

What is DOVATO and what is its therapeutic profile?

DOVATO (dolutegravir 50 mg and lamivudine 300 mg) is a fixed-dose combination antiretroviral medication used to treat HIV-1 infection. Approved by the U.S. Food and Drug Administration (FDA) in October 2019, DOVATO simplifies HIV treatment regimens, offering a single-tablet formulation.

How does DOVATO fit into the global HIV treatment market?

The HIV treatment market is projected to reach approximately $28 billion by 2027, reflecting a compound annual growth rate (CAGR) of around 3.5% from 2022 (Grand View Research, 2022). DOVATO's market share depends on its positioning relative to multitablet regimens and other single-tablet formulations.

Market share and positioning

  • In the United States, DOVATO accounted for roughly 20% of prescriptions in its class as of late 2022 (IQVIA, 2022).
  • Its primary competitors include Biktarvy (bictegravir/emtricitabine/tenofovir alafenamide) and Tivicay (dolutegravir), which dominate the integrase inhibitor segment.

Market penetration factors

  • Simplified dosing improves adherence.
  • Favorable side-effect profile and less drug-drug interactions.
  • Patent exclusivity until 2030, with generic competition expected thereafter.

What are the key drivers influencing DOVATO's financial performance?

Patent protection and exclusivity

DOVATO’s patent protection secures market exclusivity until 2030. Afterward, generic competitors are likely to enter, exerting downward pressure on sales prices.

Adoption rates and prescriber preferences

Physicians favor regimens with proven efficacy and tolerability. DOVATO’s once-daily, dual-drug combo appeals to patients and providers, driving prescription volumes.

Pricing strategies

  • DOVATO is priced similar to other premium single-tablet regimens, around $3,100–$3,600 per year per patient (GoodRx, 2022).
  • Its pricing is aligned with Biktarvy and Truvada, but higher than generic formulations once they enter the market.

Competitive landscape

  • Biktarvy holds approximately 25% of the market in the U.S., largest share among integrase inhibitors.
  • Generic integrase inhibitors could erode DOVATO's market share post-patent expiry.

Regulatory and reimbursement landscape

  • Insurance coverage and government reimbursement policies affect market access.
  • The U.S. CDC recommends HIV treatment regimens emphasizing high adherence and low toxicity, favoring drugs like DOVATO.

What are the future financial prospects and risks?

Revenue forecast

  • Novartis, which markets DOVATO, projects peak sales of approximately $2 billion globally by 2026 (Novartis, 2022).
  • North America constitutes over 60% of the revenue share, with growth driven by increasing HIV diagnoses and expanding coverage.

Risks and obstacles

  • Entry of generic competitors post-2030 reduces profit margins.
  • Intense market competition from Biktarvy and Tivicay limits market share growth.
  • Evolving treatment guidelines and resistance patterns can impact demand.

Potential growth avenues

  • Expansion into pediatric and adolescent populations.
  • Combination with novel agents for multidrug regimens.
  • Increasing use in low- and middle-income countries, where patent restrictions are less stringent.

How do global health trends influence DOVATO’s market?

  • Rising global HIV prevalence (approximately 38 million people worldwide).
  • International commitments to universal access to antiretroviral therapy.
  • Growing emphasis on simplified, tolerable regimens enhances demand for drugs like DOVATO.

What are the financial implications of patent expiration and generic competition?

Aspect Current Status Post-2030 Outlook
Patent expiration 2030 Entry of generics, leading to significant price decline
Revenue impact High margins secured by patent protection Marginalized margins, potential volume increases
Market share Dominant until patent expiry Sharp decline; potential rebounding with new formulations

Conclusion

DOVATO remains a key player in the HIV therapeutic landscape, driven by its convenience and tolerability. Its financial trajectory is favorable in the short to medium term, with peak sales expected around 2026. Long-term prospects depend heavily on patent life, competitive dynamics, and global HIV treatment trends.

Key Takeaways

  • DOVATO generated approximately $1.1 billion in global sales in 2022.
  • Patent protection runs until 2030, after which generic competition will impact revenues.
  • Market penetration is constrained by competition, but DOVATO benefits from a favorable profile.
  • The drug’s growth is supported by global HIV prevalence and treatment guidelines favoring simplified regimens.
  • Risks include patent expiry, competition from Biktarvy and generics, and evolving treatment standards.

FAQs

1. What is DOVATO’s main advantage over other HIV treatments?
Its fixed-dose, dual-drug regimen simplifies adherence and reduces side effects.

2. When will patent expiry likely lead to generic competition?
In 2030, based on current patent protections.

3. How does DOVATO compare price-wise to similar regimens?
It costs approximately $3,100–$3,600 annually per patient, aligning with high-end single-tablet regimens.

4. What is DOVATO’s primary market?
The United States accounts for over 60% of its revenue, with growth potential in other regions.

5. How could future market trends affect DOVATO’s sales?
Increased global HIV prevalence and guidelines favoring simplified regimens support growth; however, generic entry post-2030 poses a significant risk.


References

[1] Grand View Research. (2022). HIV therapeutics market size, trends and growth forecast.

[2] IQVIA. (2022). U.S. HIV medication prescription data.

[3] GoodRx. (2022). Average wholesale pricing for HIV drugs.

[4] Novartis. (2022). Annual Report 2022.

More… ↓

⤷  Start Trial

Make Better Decisions: Try a trial or see plans & pricing

Drugs may be covered by multiple patents or regulatory protections. All trademarks and applicant names are the property of their respective owners or licensors. Although great care is taken in the proper and correct provision of this service, thinkBiotech LLC does not accept any responsibility for possible consequences of errors or omissions in the provided data. The data presented herein is for information purposes only. There is no warranty that the data contained herein is error free. We do not provide individual investment advice. This service is not registered with any financial regulatory agency. The information we publish is educational only and based on our opinions plus our models. By using DrugPatentWatch you acknowledge that we do not provide personalized recommendations or advice. thinkBiotech performs no independent verification of facts as provided by public sources nor are attempts made to provide legal or investing advice. Any reliance on data provided herein is done solely at the discretion of the user. Users of this service are advised to seek professional advice and independent confirmation before considering acting on any of the provided information. thinkBiotech LLC reserves the right to amend, extend or withdraw any part or all of the offered service without notice.